If $A$ and $B$ are not disjoint sets, then $n(A \cup B)$ is equal to
$n(A) + n(B)$
$n(A) + n(B) - n(A \cap B)$
$n(A) + n(B) + n(A \cap B)$
$n(A)\,n(B)$
(b) $n(A \cup B) = n(A) + n\,(B) – n(A \cap B)$.
If $A = \{ x:x$ is a natural number $\} ,B = \{ x:x$ is an even natural number $\} $ $C = \{ x:x$ is an odd natural number $\} $ and $D = \{ x:x$ is a prime number $\} ,$ find $A \cap D$
If $A=\{3,5,7,9,11\}, B=\{7,9,11,13\}, C=\{11,13,15\}$ and $D=\{15,17\} ;$ find
$A \cap C$
Let $A$ and $B$ be two sets. Then
Let $A$ and $B$ be two sets in the universal set. Then $A – B$ equals
Find the union of each of the following pairs of sets :
$A=\{1,2,3\}, B=\varnothing$
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